Pump



P. S. HERRING.

PUMP.

APPucATloN FILED APR. la. 1917.

1,406,859, Patented Feb. 14,' 1922.

v lqgj.

ag-7A 17 wffff@ raranr orricr..

IAUL S. HEB/RING, 0F CHICAGO, ILLINOIS.

PUMP.

T0 all i0 710m t may concern Be it known that l, Plinn S. ltliiimine, a citizen ol2 the United States, residing at Chicago,l in the county of Cool: and State of Illinois, have invented certain new and useiul Improvements in Pumps, oi `which the following is a specification.

This invention relates to air pumps and is `particularly adapted for use in connection with automobiles to furnish air ior ini'iating the tires. n I

The objects oi the present invention are to provide an air pump of exceedingly simple construction so that itcan be cheaply made; to provide a pump olf this character which will be particularly elicient and durable in operation; to provide means ifor locking the pump piston out of operativeposition; and to provide suoli other advantages as will appear more fully from the following description.

ln the accompanying diawings:

Fig.A l is an elevation showing the pump Y as applied to an automobile engine;

Fig. 2 is a sectional view taken on the line 2.-;2 of Fig. l; and,

l* ig. 3 is an enlarged detail of the piston and valve.

As illustrated in theseV drawings, ei represents the pump cylinder which may be formed integrally with a base or support 5. rlhis base or support, in some instances, may comprise a portion of the engine casing when the pump is attached to an automobile engine. The upper end of the cylinder 4l is slightly enlarged to form a seat 6 for the outlet valve 7. rIhis outlet valve comprises a iiat plate having grooves in the periphery thereof, so that the air will pass freely around the same. It is pressed down to closed position by means ci a spring 8. The upper end of the cylinder i is provided with a head or cover 9 having any suitable type ot connection l0, for connecting the tubing for conveying the air to the tires.

The cylinder 4f is provided with a piston ll which moves iireely therein, and which has grooves 1 2 in the` periphery thercozt' to allow the air to pass the saine. This piston is provided with any suitable forni of piston valve, the one shown comprising a leather cup or washer 18 which is held in position by means of a disc la and nut l5, the latter engaging with a threaded stem 16 extending upwardly from the piston il. lt will be seen that this entire structure comprises a Specification of Letters Patent.

Patented; Feb. 14, 1922.

Application filed April 13, 1917. Serial No. 161,871.

piston valve, the portion il being primarily a guide tor the valve proper.`

.ifi piston rod l? extends down from the piston 1l and its lower end iits in a bearing rod 2lV whichezrtends out through slots 22 in A coiled compre'sthe sides oi' the cylinder. n sion spring 28 engages with the projecting ends oit the cross head 2i and with the outwardly extending portion oi? the cover or head 9, and tends to urge the piston downwardly. s I

A' rotatable sleeve 2li lits-within a circumerential recess 25 around the lower end of the cylinder Li, and is provided with projecting ears 2G, whereby it may be readily turned. rlhe upper end ci" this sleeve is made in the iform ot two semi-'circular cams 27 which engage with the ends of the cross head 2l, and notches or recesses 28 are provided at the upper ends or these cams so that when the ends of the cross head engage with these notches, the cross head and connected parts will be held in raised position.

llilhen the pump is to be operated, the

sleeve is turned to release the cross head or guide rod 2l which permits the spring 23 to urge the piston rod 1T down against the rod 2l and hold the parts out of operative position.

It will be seen from the above description and the accompanying drawings that l provide an exceedingly simple form ot pump which may be readily assembled., and an exceptionally large and flexible spring may be used on account oil having the saine surround the cylinder.

Various changes in the details of the construction may be made without departing from my invention, therefore, l do not wish to limit myself Jlurther than is set forth in the Jiollowing claims in which I claim:

l. In an air pump, the combination of a cylinder having slots in the side thereof, a piston, a' piston rod, a pin engaging with said rod and extending out through said slots, a compression spring arranged around the outer circumference of the cylinder and engaging with said pin for moving the piston in one direction, and a cam sleeve for moving the pin against the pressure of the spring and locking it in raised position.

2. An air pump comprising a cylinder having guide Ways in the side thereof, a piston in said cylinder, a guide rod or said piston extending out through said guide Ways, a spring surrounding said cylinder and engaging with the ends `or said guide rod to move the piston in one direction, a piston rod, a cam ifor moving the rod against the tension of the spring, and a rotatable sleeve adapted to engage with said Guide rod to hold the piston rod out of engagement with said cam.

3. An air pump comprising a cylinder having slots in the side thereof and having an integrally formed bearing at one end7 a piston, a piston rod engaging with said bearing, a cam coacting With said piston rod, a guide connected With said piston rod and extending out through said slots, a spring surrounding said cylinder with one end en- 'aging with said guide, a head for said cyliiidei",e;teiidi1ig outwardly to engage with said spring, a rotatable sleeve fitting in a recess in the outer surface of the cylinder,`

`and also having guide-Ways in the sides thereof, a cross piece extending from said stem through said last named guide-Ways, a rotatable ineniber surrounding said casing and adapted to engage with the cross piece to lock the piston in raised position, `a

spring arranged outside of the cylinder be-V tween the head and cross member for moving the piston in one direction, and means for moving the piston in the opposite d1- rection.

PAUL S. HERRING. 

